This indicator was addressed by a self - report measure showing a 23 per cent difference between the two samples. (teachermagazine.com.au)
However, after social differences between mothers were taken into account there was only a 30 per cent difference. (telegraph.co.uk)
«We found a 35 per cent difference in feed use per tonne of salmon produced between Norway and Chile, the least efficient region,» says Pelletier. (newscientist.com)